Traveling crane



(No Model.) f WLM. BROOKE. TRAVELING CRANE.

No. 528,248. 7 v Patented 001;. 30, 1 894..

UNITED STATES PATENT OFFICE.

WILLIAM M. BROOKE, OF NEW YORK, ASSIGNOR TO LETTY O. BENSON, OFBROOKLYN, NEW YORK.

TRAVELING CRANE.

SPECIFICATION forming part of Letters Patent No. 528,248, dated October30, 1 894.

Application filed March 31, 1894; Serial No. 505,316. (No model.)

To all whom it may concern:

Be it known that 1, WILLIAM M. BROOKE, of New York, in the county andState of New York,.have invented a new and useful Improvement inTraveling Cranes, of'which the following is a specification. Y

My invention relates to an improvement in traveling cranes, with theobject in view of increasing the purchase to such an extent as to beable to raise a very heavy weight with a very slight expenditure ofpower and at the same time keeping the several parts within practicallimits of extension. a

A practical embodiment of my invention is represented in theaccompanying drawings, in which- Figure l is a view of the crane in sideelevation, showing it mounted upon a truck, and Fig. 2 is a top planview of the same, the supporting arm of the crane being partiallybrolaan away to show the operating parts henea The platform of the craneis denoted by A- ing levers O, O are pivotally secured at any desireddistance from theircenters to impart to the free ends of their longerarms the desired amount of travel to elevate the object to be carriedthe proper distance above its point of rest. For this purpose the lovers0 and C are each provided with a series of perforations c, c forreceiving the pivotal bolt. The two levers O and Oare connected to theupright B at the same distances from their respective ends. A pair ofuprights D, D are loosely connected with the opposite ends of the leversO, C forming, together with the levers O, O, a parallelogram of barsjointed at its angles. One of the uprights, D for example, carries asupporting arm E, being firmly fixed to the upright D. The oppositeupright D has fixed thereto a bracket F, to the under side of which isfixed a horizontal bar f extending from a point exterior to theparallelogram of bars to a point within the field of the saidparallelogram of bars, at which point it is connected by a loose jointwith alinkG, extending from within the field of the parallelograin ofbars and fixed firmly to-the upright D at a point below the horizontalarm f.

A lever of the second class I, is fulcrumed at 11 in one of the severalperforations b, through the standard B, and is connected at a pointabout midway of its ends, as at i, with the link G. The free end of thelever I-for purposes of operating itis provided with a flexibleoperating connection K extending from the end of the lever I, downunderneath a pulley a mounted in a projecting arm a of the platform Aand thence to a winding drum 70, mounted in a suitable support upon theplatform A, and having fixed to rotate therewith a ratchet toothed wheelk. An operating lever L is'loosely pivoted to the shaft of the drum kand carries a pawl Z for engaging the ratchet wheel is" to rotate it andhence. draw down on the end of the lever I. A retaining pawl l is alsoprovided to hold the winding drum is in position to hold the free end ofthe lever I down.

A stop bar M is pivoted at one end, as at'm to the standard B and itsopposite end is connected through an elongated slot m withthe upwardlyextended end of the upright D for the purpose of limiting the movementsof the parallelogram of bars.

In operation, the downward pull on the free end of the lever I willdepress the link G, which in turn will depress the upright D and henceelevate the upright D and with it the crane arm E and the weightsuspended therefrom.

By means of the several series of perforations, the bars may be placedin different relations, so as to make the supporting arm E rise agreater or less distance, as may be required.

What I claim is 1. The combination with a crane supporting arm, of aparallelogram of bars to one of which the crane arm is fixed, a standardto which two opposite sides of the parallelogram of bars are pivoted,and a leverpivoted to the standard and connected with one of the par-ISO allelogram of bars for tilting the parallelogram of bars and hencelifting the weight; substantially as set forth.

2. The combination with a standard and a 5 suitable support for it, of aparallelogram of bars,two opposite sides of said parallelogram of barsbeing secured to the standard, a weight supporting arm secured to one ofthe parallelogram of bars, two horizontal arms secured to the oppositebar of the parallelogram of bars, a link connecting said two horizontalarms and a lever pivotally secured to the standard and connected withthe link for tilting the parallelogram of bars and hence lift- I 5 ingthe Weight, substantially as set forth.

3. A standard fixed upon a movable carriage, a parallelogram of barshaving two opposite sides pivotally secured to the standard and a weightsupporting arm fixed to one of the two opposite sides of theparallelogram of bars, two horizontal bars fixed to the opposite side ofthe parallelogram of bars, a link connecting said two horizontal bars, alever pivotally secured to the standard and connected with said linkand. means for operating said lever to depress the link and thereby tiltthe parallelogram of bars to elevate the weight, substantially as setforth.

e. The combination with a suitable standard, a parallelogram of barshaving two opposite bars of the parallelogram pivoted to the standard, aweight supporting arm fixed to one side of the parallelogram of bars, anoperating lever pivotally secu red to the standard and connected throughintermediate parts with the opposite side of the parallelogram of barsand a stop bar pivotally secured to the standard and having a looseconnection with the parallelogram of bars, substantially as set forth.

WILLIAM M. BROOKE. lVitnesses:

FREDK. HAYNES, IRENE B. DECKER.

